Islington was originally named by the Saxons Giseldone (1005), then Gislandune (1062). The name means 'Gīsla's hill' from the Old English personal name Gīsla and dun 'hill', 'down'. The name then later mutated to Isledon, which remained in use well into the 17th century when the modern form arose.[2] In medieval times, Islington was just one of many small manors in the area, along with Bernersbury, Neweton Berewe or Hey-bury, and Canonesbury (Barnsbury, Highbury and Canonbury - names first recorded in the 13th and 14th centuries). "Islington" came to be applied as the name for the parish covering these villages, and was the name chosen for the Metropolitan Borough of Islington, on its formation in 1899. On the merger with Finsbury, to form the modern borough this name came to be applied to the whole borough.

Islington is divided into 16 wards, each electing three councillors.[4] Following the May 2014 election, Islington Council comprises 47 Labour Party councillors and 1 Green Party councillor.[5] Of these 48 councillors, the Leader of the Council is Councillor Richard Watts, while the Mayor is Councillor Theresa Debono.[5][6]

Islington has a wide variety of transportation services, with direct connections to the suburbs and the City and West End. Islington also has ten tube stations within its boundaries, with connections by the tube to all around London.

In March 2011, the main forms of transport that residents used to travel to work were: underground, metro, light rail, tram, 19.4% of all residents aged 16–74; bus, minibus or coach, 10.3%; on foot, 10.3%; bicycle, 6.2%; driving a car or van, 6.0%; train, 3.7%; work mainly at or from home, 3.6%.[8]

In 1801, the civil parishes that form the modern borough had a total population of 65,721. This rose steadily throughout the 19th century, as the district became built up; exceeding 200,000 in the middle of the century. When the railways arrived the rate of population growth increased—reaching nearly 400,000 by the turn of the century; with the Metropolitan Borough of Finsbury particularly suffering deprivation, poverty and severe overcrowding. The increase in population peaked before World War I, falling slowly in the aftermath until World War II began an exodus from London towards the new towns under the AbercrombiePlan for London (1944). The decline in population reversed in the 1980s, but it remains below its 1971 level.

According to the 2001 census Islington had a population of 175,797. It was 75% White, including 5% White Irish, 6% Black African, 5% Black Caribbean and 2% Bangladeshi. 32% of the borough's residents were owner–occupiers.

According to the 2011 census, Islington has the highest population density of local authorities in England and Wales—13,875 people per km2.[9]

The borough currently maintains 47 primary schools, 10 secondary schools, three special schools and five Pupil Referral Units. In 2000, Cambridge Education Associates, a private firm, took over the management of the Islington's state schools from the local education authority.[11]